EP0531288A1 - Method for drying, especially waste material, such as shrimp or crayfish shell, fish offal, etc. - Google Patents
Method for drying, especially waste material, such as shrimp or crayfish shell, fish offal, etc.Info
- Publication number
- EP0531288A1 EP0531288A1 EP90910612A EP90910612A EP0531288A1 EP 0531288 A1 EP0531288 A1 EP 0531288A1 EP 90910612 A EP90910612 A EP 90910612A EP 90910612 A EP90910612 A EP 90910612A EP 0531288 A1 EP0531288 A1 EP 0531288A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- drying
- chamber
- product
- shrimp
- fish
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B3/00—Drying solid materials or objects by processes involving the application of heat
- F26B3/02—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air
- F26B3/10—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour carrying the materials or objects to be dried with it
-
- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23B—PRESERVING, e.g. BY CANNING, MEAT, FISH, EGGS, FRUIT, VEGETABLES, EDIBLE SEEDS; CHEMICAL RIPENING OF FRUIT OR VEGETABLES; THE PRESERVED, RIPENED, OR CANNED PRODUCTS
- A23B4/00—General methods for preserving meat, sausages, fish or fish products
- A23B4/03—Drying; Subsequent reconstitution
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B1/00—Preliminary treatment of solid materials or objects to facilitate drying, e.g. mixing or backmixing the materials to be dried with predominantly dry solids
- F26B1/005—Preliminary treatment of solid materials or objects to facilitate drying, e.g. mixing or backmixing the materials to be dried with predominantly dry solids by means of disintegrating, e.g. crushing, shredding, milling the materials to be dried
Definitions
- the present invention relates to a method for drying, especially waste material, such as shrimp or crab shells, fish offal, etc., to produce a fine-grained base material or additive for foodstuffs or animal fodder, whereby the starting material, optionally after coarse comminution, is passed to a chamber in which it is accelerated in a turbulent air current into various paths of movement, so that the material lumps continuously collide with each other, whereby they are decomposed into smaller and smaller pieces, thereby continuously exposing new surfaces of rupture.
- waste material such as shrimp or crab shells, fish offal, etc.
- the water is present in the product partly as free water and partly as bound water. Together with the traditional drying methods (convection) the speed of drying is high to begin with as the free water on the surface rapidly evaporates, whereas the capillary convey ⁇ ance of the "bound" water from the interior of the product towards its surface is considerably slower.
- flavour constituents and pigments in the product are released and retained quality-wise.
- the air passed to the drying chamber is imparted partly with the inlet tempera- ture of the starting material, and partly with the temperature which is determined by the decomposition rate, and the air is added in an amount adjusted according to the amount of starting material introduced per time unit, so that the free water is immediately removed from the exposed surfaces of rupture by evaporation, and so that the material is retained in the chamber by way of an exerted counter-pressure until a predetermined size of the pieces or particles has been achieved.
- the original surface area gets at least 75-250 times larger, dependent upon the size of the starting products and end products, as a result of which the drying is restricted to a strict surface drying.
- the drying rate thereby becomes directly dependent on the rate at which (a) new surfaces are exposed and (b) heat energy is supplied. According to the invention these preconditions can be arranged as rapid progressions, and consequently also a very rapid drying is achievable.
- the product temperature during the critical period of the drying course only gets to increase by a few degrees above the inlet temperature of the raw material.
- the very low temperature increase of the product during the drying means that no appreciable denaturation of the protein content of the product takes place.
- flavour substances and pigments bound in the product tissue are released. This is achieved solely as a consequence of the low and consequently gentle temperature increase to which the product is exposed during the processing and drying.
- the object of the drying (which, as it is, is a pure preservation method) is to dry a wet, quality-wise unstable product to a dryness which entails maximum stability.
- the products are normally subjected to a number of decomposing and quality reducing processes, such as oxidation of flavour and aroma substances, discolouration, tissue rupture by osmosis, build-up of concentration gradients of salts and soluble substances by diffusion, biological and enzymatic decomposition etc. All these quality reducing processes are dependent on time, temperature and water activity. For example, several of these processes are characterized by having a velocity maximum at some of the water activities which the products undergo during the drying.
- the quality impairing processes can thus be reduced to a minimum, and the natural and high quality of the raw material can be preserved in the dried product.
- the method according to the invention consumes only 700-850 kcal/kg evaporated water. This is due to the thermal efficiency being very high. The reason for this is that the supplied heat is only used for evaporating the free water and only to a very small extent for heating the product.
- the principle is a direct conversion of the raw material into a powder in a hot, vertical air current, which at a controlled rate provides for conveyance of the dry product to the discharge means.
- the relatively heavy, moist product is kept floating until most of the water has evaporated.
- the product is first dried in whole state, whereafter it is decomposed to the desired size. This is a method which from a viewpoint of energy consumption is very inexpedient as the evaporation rate decreases with the size of the product introduced.
- the method used for exposing new surfaces is based on the impact principle, i.e. product against product in an air current.
- the air current which is used as drying media, is simultaneously used for exposing new product surfaces. Due to the rotor/stator form the considerable air flow through the swirl drying chamber will generate many turbulent air currents which accelerate the product to a very high speed required for comminuting the material by the products impinging against each other.
- the turbulent flow in the swirl drying chamber is very important, as a laminar flow could not provide the desired effect as regards comminuting the product.
- It is a characteristic feature of the impact principle that it is capable of bursting both hard and soft tissue types, i.e. shells or bones as well as meat and connective tissue. Further, the principle makes very modest demands on the size of the raw material, and it is possible to introduce whole claws and heads of sea crab as well as whole shrimp directly into the swirl drying chamber without prior comminution.
- the swirl drying chamber may advantageously be a machine sold under the tradename Ultra-Rotor which today is used mainly for fine-grinding of chemicals, plastics, etc.
- a machine has a rotor being provided with a number of horizontal discs along the periphery of which a large number of radial plates are positioned, the said discs together forming many small chambers, and a stator having a grooved surface.
- the rotor rotates at very high velocity turbulent air currents arise between the chambers due to the unevennesses of the stator and due to changes in the directions, velocity and acceleration of the air currents when passing in and out between the air chambers of the rotor.
- the drying course is controllable by setting the follow ⁇ ing:
- the temperature of the raw material By lowering the inlet temperature of the raw material, the temperature of the product during the drying can be limited to any desired level.
- particularly sensitive materials can be dried at a temperature below the freezing point.
- the temperature of the inlet air By increasing the temperature the capacity is increased simultaneously with the drying time being reduced.
- the amount of air contra product quantity After setting the temperature of the inlet air and the raw material the heat economy is optimized during the drying through a minimization of the amount of air relative to the quantity of raw material.
- the object according to the invention was used for producing a powder of offal from sea crayfish.
- claws and heads of sea crayfish were passed to the swirl drying chamber. These claws and heads were of a size of 15-20 cm and 5-7 cm, respectively, and had a water content of about 80%.
- the material was coarsely comminuted in the conveyor screw to a size of about 5 cm. 350 kg raw material were introduced per hour.
- the chamber inlet air had a temperature of 450 °C and was introduced in an amount of 4000 m 3 .
- the water content had been reduced to below 8-10%, and in the finished powder the grain size was below 85 ⁇ m in respect of 45% of the product, and below 150 ⁇ m in respect of all the product.
- the product was dried directly from frozen state as well as from unfrozen (or thawed) state. The state of the product before the drying was not important for the comminution properties, but only influenced the heat consumption, because extra heat energy was needed for thawing the product as well as for the water evaporation.
- the conditions of the drying course entail that under the influence of the very high temperature of the drying air there is achieved a sterilizing effect on the product, i.a. because bacteria on the surface and in the outer material layer are killed when the material is introduced into the swirl drying chamber.
- the powder from the drying chamber can be used directly, but in case of high demands on the particle size it may also advantageously be passed to classifying means of conventional type coupled after the chamber. By that means it becomes possible to remove oversize particles or material lumps from the flow of material leaving the chamber and return them to the chamber inlet.
- the finished product from the swirl drying chamber is a pink dry powder which is usable as natural stock or flavour extract for processed fish products, such as shrimp or lobster soup and as additive in instant food. Due to the released flavour substances and pigments the finished product can replace a variety of the artificial additives used today.
- a sea crayfish powder was produced by the method according to the invention from raw or boiled sea crayfish offal in the form of heads and claws of raw sea crayfish.
- the raw material had a water content of about 80% calculated on total weight, and the product was dried under continuous comminution to a water content of about 10%.
- the product was visually characterized by a pink colour and a distinct taste of sea crayfish.
- the product After the drying and comminuting process the product had achieved a very fine granulation of the size 10-500 ⁇ m. This comminution causes a more or less total release of flavour and colour substances which otherwise would have been bound in the meat and shell structures. This makes the product especially suited for human food, as the product readily replaces a variety of the synthetic flavour substances and extracts used today.
- the powder in question consists of 100% sea crayfish (apart from a residual water content of about 10%).
- the powder may form part of fish pies, soups and the like as a completely natural raw material since the gentle process by which the powder is produced in no way has denaturated the natural composition of the raw material, but has merely removed the majority of the water content.
- the product or parts thereof e.g. particles larger than 70-100 ⁇ m, may secondarily be used within the fodder sector, as especially in this fraction there is a large calcium content as well as a certain astaxantine content.
- Raw material Whole fresh or frozen sea crayfish or parts thereof (Norwegian Lobster).
- Aroma Strong or delicate taste of sea crayfish.
- Shrimp meal was produced by the method according to the invention from shells and other offal components from the shrimp shelling industry or alternatively from whole shrimp.
- the raw material may be of various kinds, but the experiment was carried out on the species Pandalus Borealis, generally called North Atlantic shrimp.
- the water content in the raw material was about 80% calculated on total weight, and the product was dried under comminution to a water content of about 10%
- the product was visually characterized by a pink colour and a distinct taste and smell of shrimp.
- the product After the drying and comminuting processes the product achieved a very fine granulation to a granulate size of 10-500 ⁇ m. This comminution causes a more or less total release of the flavour and colour substances which otherwise would have been bound in the meat and shell structures, which makes the product well-suited for use in the fish fodder sector, especially for trout and salmon fodder.
- the shrimp's natural content of astaxantine which is retained in the powder as a consequence of the gentle process is via the fodder assimilated in the fish body and results in the strived at red colouring of the meat.
- the very fine granulation of the powder further entails that the fodder coefficient in the finished fodder is lower than in corresponding known fodder types, which is a consequence of improved assimilation of the product in the digestive organs of the fish.
- An improved exploitation of the fodder also means less contamination of the water in which the fish stay, as they do not give off as much of the fodder.
- the last feature is a very significant point as regards the environment.
- the powder may also be part of human food as a replacement of synthetically produced flavour substances.
- Raw material Whole fish or frozen deep-water prawn (Pandalus Borealis) or parts thereof.
- Aroma Distinct taste of fresh shrimp. Freely flowing powder.
- a fish powder was produced by the method according to the invention from raw residual products (fish meat from fish carcass after filleting) from fillet production or the like fish processing. The experiments were carried out on parts from cod.
- the water content in the raw material was about 80-85% calculated on the total weight, and after drying under comminution the product had a water content of about 10%.
- the product was visually characterized by a pale to greyish colour and a relatively neutral smell. Like in the raw material, the taste is slightly sweet.
- the product After the drying and comminuting process the product achieved a very fine granulation with a particle size of 10-500 ⁇ m. This comminution causes more or less total release of flavour substances which would otherwise have been bound in the meat structure, and consequently the product is usable in foodstuffs in view of replacing the synthetically produced flavour substances and extracts used today.
- the fish powder in question consists of 100% fish meat (apart from a residual water content of about 10%).
- the powder may form part of fish pies, soups and the like as a completely natural raw material.
- no denaturation is effected of the natural composition of the raw material apart from a reduction in the water content.
- the powder is immediately usable in all situations requiring fish taste or requiring an extra water uptake in the product. Under normal circumstances the fish powder may take up about 250-270% of its own weight. This property is particularly utilizable in pies, fish sausages and the like, where it is in the interest of the producer to bind the free water.
- the water uptake further means that the product can be used as binder in the above or like products.
- Raw material Clean-offs from filleting white roundfish
- Aroma Delicate taste of fresh roundfish. Freely flowing powder.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Microbiology (AREA)
- Zoology (AREA)
- Wood Science & Technology (AREA)
- Chemical & Material Sciences (AREA)
- Food Science & Technology (AREA)
- Polymers & Plastics (AREA)
- Fodder In General (AREA)
- Meat, Egg Or Seafood Products (AREA)
- Processing Of Solid Wastes (AREA)
- Apparatuses For Bulk Treatment Of Fruits And Vegetables And Apparatuses For Preparing Feeds (AREA)
- Formation And Processing Of Food Products (AREA)
Abstract
On sèche les déchets tels que les carapaces de crevette ou de crabe, les issues de poisson, etc. afin de produire une matière de base ou un additif à grain fin apte à s'utiliser dans les denrées alimentaires et le fourrage pour animaux, en soumettant une matière initiale à un écoulement d'air turbulent dans une chambre, ce qui envoie les mottes de matière dans tous les sens. Les mottes se heurtent en continu les unes contre les autres, ce qui découvre constamment de nouvelles surfaces de rupture. La chambre est alimentée en air dont la température dépend d'une part de la température de la matière initiale et d'autre part de la vitesse de désintégration, le débit d'entrée de l'air étant réglé en fonction de la quantité de matière initiale introduite par unité de temps. L'eau non combinée peut immédiatement quitter par évaporation les surfaces de rupture découvertes. En créant une contre-pression, on peut maintenir la matière dans la chambre jusqu'à ce que les particules aient atteint des dimensions voulues. Si les particules quittant la chambre sont trop grandes, on les sépare puis on les renvoie à l'entrée de ladite chambre.Waste is dried such as shrimp or crab shells, fish products, etc. in order to produce a raw material or a fine-grained additive suitable for use in foodstuffs and animal fodder, by subjecting an initial material to a turbulent air flow in a chamber, which sends clods of matter in every way. The clods collide continuously against each other, which constantly discovers new breaking surfaces. The chamber is supplied with air, the temperature of which depends on the one hand on the temperature of the initial material and on the other hand on the disintegration speed, the air inlet flow rate being adjusted as a function of the quantity of material. initial entered per unit of time. Uncombined water can immediately leave exposed rupture surfaces by evaporation. By creating a back pressure, the material can be held in the chamber until the particles have reached desired dimensions. If the particles leaving the chamber are too large, they are separated and then returned to the entrance to said chamber.
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT90910612T ATE110462T1 (en) | 1990-06-06 | 1990-06-06 | PROCESSES FOR DRYING, IN PARTICULAR WASTE MATERIAL SUCH AS SHRIMP OR CRABS SHELLS, FISH LEFTS AND THE LIKE. |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE8900003A SE8900003L (en) | 1989-01-02 | 1989-01-02 | SET FOR DRYING IN PARTICULAR COMMITTEE MATERIALS LIKE SHARP AND POWER SHEET, FISH WASTE, ETC |
CA002082175A CA2082175A1 (en) | 1989-01-02 | 1990-06-06 | Method for drying, especially waste material, such as shrimp or crayfish shell, fish offal, etc. |
PCT/DK1990/000137 WO1991019144A1 (en) | 1989-01-02 | 1990-06-06 | Method for drying, especially waste material, such as shrimp or crayfish shell, fish offal, etc. |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0531288A1 true EP0531288A1 (en) | 1993-03-17 |
EP0531288B1 EP0531288B1 (en) | 1994-08-24 |
Family
ID=20374660
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP90910612A Expired - Lifetime EP0531288B1 (en) | 1989-01-02 | 1990-06-06 | Method for drying, especially waste material, such as shrimp or crayfish shell, fish offal, etc. |
Country Status (9)
Country | Link |
---|---|
US (1) | US5345693A (en) |
EP (1) | EP0531288B1 (en) |
JP (1) | JPH05508303A (en) |
AU (1) | AU642421B2 (en) |
CA (1) | CA2082175A1 (en) |
DE (1) | DE69011875T2 (en) |
NO (1) | NO924315L (en) |
SE (1) | SE8900003L (en) |
WO (1) | WO1991019144A1 (en) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5632097A (en) * | 1996-06-28 | 1997-05-27 | Snitchler; William H. | Brine shrimp cyst drying device |
US6820351B1 (en) | 2002-01-31 | 2004-11-23 | North American Brine Shrimp, L.L.C. | Brine shrimp egg processing apparatus and method |
US7024796B2 (en) | 2004-07-19 | 2006-04-11 | Earthrenew, Inc. | Process and apparatus for manufacture of fertilizer products from manure and sewage |
US7694523B2 (en) | 2004-07-19 | 2010-04-13 | Earthrenew, Inc. | Control system for gas turbine in material treatment unit |
US7024800B2 (en) | 2004-07-19 | 2006-04-11 | Earthrenew, Inc. | Process and system for drying and heat treating materials |
US7685737B2 (en) | 2004-07-19 | 2010-03-30 | Earthrenew, Inc. | Process and system for drying and heat treating materials |
FR2873898A1 (en) * | 2004-08-04 | 2006-02-10 | Frederic Coquerel | Food preparation for making crayfish soup uses all or part of cephalothorax, boiled and ground, with added onions, carrots and/or tomato concentrate |
US7610692B2 (en) | 2006-01-18 | 2009-11-03 | Earthrenew, Inc. | Systems for prevention of HAP emissions and for efficient drying/dehydration processes |
US10443188B2 (en) | 2016-05-25 | 2019-10-15 | Apache Mills, Inc. | Process for cut pile carpet tiles with seamless appearance |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2588865A (en) * | 1948-07-29 | 1952-03-11 | John H Bruninga | Art of treating legumes |
US3140202A (en) * | 1962-01-09 | 1964-07-07 | American Sugar | Dry pulverulent brown sugar and process for producing same |
US3360870A (en) * | 1964-01-02 | 1968-01-02 | Fluid Energy Proc & Equipment | Apparatus for pulverizing and drying solids |
GB1498464A (en) * | 1975-04-26 | 1978-01-18 | Niro Atomizer As | Process and an apparatus for converting a solution or suspension into a dried particulate granulate product |
US4226027A (en) * | 1979-03-27 | 1980-10-07 | Aljet Equipment Company | Material feed system for jet mills and flash dryers |
SE442023B (en) * | 1981-02-11 | 1985-11-25 | Svensk Exergiteknik Ab | PROCEDURE FOR PREPARING BETMAS FROM SUGAR BEETER AND DEVICE FOR IMPLEMENTATION OF THE PROCEDURE |
-
1989
- 1989-01-02 SE SE8900003A patent/SE8900003L/en not_active Application Discontinuation
-
1990
- 1990-06-06 EP EP90910612A patent/EP0531288B1/en not_active Expired - Lifetime
- 1990-06-06 AU AU60760/90A patent/AU642421B2/en not_active Ceased
- 1990-06-06 JP JP2510655A patent/JPH05508303A/en active Pending
- 1990-06-06 CA CA002082175A patent/CA2082175A1/en not_active Abandoned
- 1990-06-06 DE DE69011875T patent/DE69011875T2/en not_active Expired - Fee Related
- 1990-06-06 WO PCT/DK1990/000137 patent/WO1991019144A1/en active IP Right Grant
- 1990-06-06 US US07/956,021 patent/US5345693A/en not_active Expired - Fee Related
-
1992
- 1992-11-10 NO NO92924315A patent/NO924315L/en unknown
Non-Patent Citations (1)
Title |
---|
See references of WO9119144A1 * |
Also Published As
Publication number | Publication date |
---|---|
SE8900003D0 (en) | 1989-01-02 |
AU642421B2 (en) | 1993-10-21 |
DE69011875T2 (en) | 1994-12-15 |
CA2082175A1 (en) | 1991-12-07 |
WO1991019144A1 (en) | 1991-12-12 |
EP0531288B1 (en) | 1994-08-24 |
NO924315D0 (en) | 1992-11-10 |
US5345693A (en) | 1994-09-13 |
AU6076090A (en) | 1991-12-31 |
DE69011875D1 (en) | 1994-09-29 |
NO924315L (en) | 1992-11-10 |
SE8900003L (en) | 1990-07-03 |
JPH05508303A (en) | 1993-11-25 |
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